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Conjoined Twins
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These cases courtesy of Stephen Sisnott, Melbourne, Australia
16 weeks a b b
     
a b b
Conjoined twins at 16 weeks gestation. Note fused cranium.  
20 weeks a b  
     
a b  
Same conjoined twins shown above. This study was completed at 20 weeks gestation.  
30 weeks a b  
     
a b  
Different gestation of conjoined twins than shown above. These twins not only demonstrate fused cranium, but also share a single bladder and kidney.  
postnatal a b  
  Postnatal MR images correspond to the 30 week fetuses above.